I think I have read on here of people that have done it, but it is very difficult to remove the poly without destroying the coil. The way it is wrapped around the silica sleeve that is around the coil and the fact that one of the leads of the coil goes to the top of the carto and back down, make it almost necessary to unsolder the leads from the base and remove the unit as a whole.

I have rebuilt a couple of SmokTech dual coils. I completely ripped out the coil but retained the non resistant wires and rebuilt as a single coil. Both work just fine but I then went on to Genesis atties and got stuck to using cotton wick atties which were simpler to rebuild.